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杨辉三角形
Author:
孟宝兴
GeoGebra
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三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
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An angle problem
Quiz on Addition and Subtraction of Directed Numbers (1) 有向數加減測驗(1)
Parallelogram 02
中華民國國旗
內擺線觀察
Discover Topics
Volume
Differential Equation
Trapezoid
Symmetry
Constructions